Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

The components of inventories are as follows:

	March 31, 2019			December 31, 2018
	(in thousands)
Raw materials	$	67,519		$	67,995
Work in process	3,131			4,060
Finished goods	5,494			6,767
	76,144			78,822
Less:  Allowance for excess and obsolete inventories	(1,567		)	(1,210		)
Total, net	$	74,577		$	77,612

Inventories (Allowance)

The related changes in the allowance for excess and obsolete inventories account are as follows:

	Three months ended
	March 31, 2019		March 31, 2018
Allowance for excess and obsolete inventories:	(in thousands)
Balance, beginning of period	$	1,210	$	1,118
Provisions for excess and obsolete inventories	357		101
Inventories written off	—		(10		)
Balance, end of period	$	1,567	$	1,209